Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -41,7 +41,7 @@ jobs:
           echo "PUSH=${push}" >> ${GITHUB_ENV}
           echo "TAG=${tag}" >> ${GITHUB_ENV}
           echo "TAGS=${tags}" >> ${GITHUB_ENV}
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: docker/login-action@v3
         if: env.PUSH == 'true'
         with: